文档介绍：X. Proofreading and error correction (17 passages)
Proofreading and error correction (10 marks)
Directions:
The following passage contains 10 errors. Each indicated line contains one error only. In each case, only one word is involved. You should proofread the passage and correct it in the following manner:
For a wrong word, underline the wrong word and write the correct one in the blank provided at the end of the line.
For a missing word, mark the position of the missing word with a "A” sign and write the word you believe to be missing in the blank provided at the end of the line.
For an unnecessary word, cross the unnecessary word with a slash "尸 and put the word in the blank provided at the end of the line.
Your answer SHOULD be put on the Answer Sheet.
Passage 2
Many of the computing patterns used today in elementary
long
as the
mentalancient
arithmetic. Such as these for performing

multiplications and divisions, were developed so late

fifteenth century. Two reasons are usually advanced to account for this tardy development, named, the

difficulties and the physical difficulties encountered in such work. The first of these, the mental difficulties, must be
somewhat discounted. The impression which the
numeral systems are not amenable to even the simplest calculations is largely based on lack of familiarity to these [5]
systems. It is clear that addition and subtraction in a simple grouping system require only ability to count the number symbols of per kind and then to convert to higher units. No
-
memorization of number combinations is needed. In a
ciphered numeral system, if sufficient addition and memorization tables have been memorized, the work can proceed much as we do it physical difficulties
encountered,
therefore,
were

quite real. Without a plenty and convenient supply of some

suitable writing medium, any very extended development
of the arithmetic process was bound to being hampered. It

made